生长素引发对盐胁迫下棉花生长发育及产量品质的影响

Effects of Auxin Priming Treatment on Cotton Growth,Yield and Quality under Salt Stress

以‘浙大13-1’和‘浙大13-2’两个棉花品种为试验材料,研究了不同浓度的生长素IAA溶液(10,20,50 mg/L)引发处理对盐胁迫下棉花生长发育及产量品质的影响。结果表明,在盐胁迫(1.0%NaCl)条件下,IAA引发可显著提升棉花种子萌发能力和幼苗耐盐性。盐胁迫下,种子经IAA引发的棉花幼苗超氧化物歧化酶(superoxide dismutase,SOD)活性和过氧化物酶(peroxidase,POD)活性显著增强,丙二醛(malondialdehyde,MDA)含量降低,光合作用增强,从而提高棉花幼苗耐盐性。在盐碱土壤环境下,种子经IAA引发的棉花植株的烂铃率下降,产量提升,纤维的断裂比强度提升。综上所述,种子IAA引发能提高棉花整个生育期的耐盐性,且经20 mg/L的IAA溶液引发处理效果最佳。本研究结果为盐碱地植棉提供理论依据。

The effect of seed priming with different concentrations of IAA(10,20,50 mg/L)on growth,yield,and fiber quality of cotton under salt stress was studied,using two cotton cultivars'ZD13-1'and'ZD13-2'.The results indicated that the treatment of seed priming with IAA could significantly improve the germination ability and salt resistance of cotton seedlings under salt stress(1.0%NaCl).Under salt stress,the activities of superoxide dismutase(SOD)and peroxidase(POD)of cotton seedlings which seed priming with IAA were significantly increased,the con tent of malondialdehyde(MDA)was reduced,and photosynthesis was enhanced,thereby improving the salt tolerance of cotton seedlings.In saline soil,the boll rot rate of cotton plants which seed priming with IAA was decreased,the yield was increased,and the fiber strength was improved.The above results indicated that IAA priming treatment could enhance the salt tolerance of cotton during the whole developmental stage,and the treatment effect was best with IAA solution of 20 mg/L.The study provided a theoretical basis for the application of cotton planting in saline soil.